Twin motor



Sept. 23 1924.

F. A. BENTZLIN TWIN MOTOR Filed Dec. 6, 1922 3 Sheets-Sheet 1 ii 5 M II Fig.1.

INVENTOR. 5 73 ATTORNEY.

Sept. 23 1924.

F. A. BENTZLIN TWIN MOTOR s Sheets-Sheet 5 Filed Dec 6, 1922 INVENTOR ATTORNEY.

Patented Sept. 23, 1924.

UNITED STATES FRANK A. BENTZLIN, 0F ANDRUS, WISCONSIN.

TWIN MOTOR.

Application filed December 6, 1922. Serial No. 605,276.

To all whom it may concern:

Be it known that I, FRANK A. BEN'rzLIN, a citizen of the United States, residing at Andrus, in the county of Polk and State of Wisconsin, have invented a new and useful Twin Motor, of which the following is a specification.

My invention relates to improvements in intcrnahcombustion motors; and the objects of my improvements are, first, to provide an internal-combustion motor having a wide range of power and speed, which is simple, compact, self-contained, steady, well balanced, not subject to over-heating, light,

'readily portable, and specially adapted for farm or analogous use; second, to provide an internal-combustion motor of the four cycle type, in which an impulse may be given to the crank shaft at each revolution; third, to provide a multiple cylinder motor in which one or more cylinders may be operated as desired; fourth, to provide means for relieving the compression of a cylinder so as to throw it out of operation; and fifth, to provide suitable means for effecting power and speed changes in the motor; and sixth, to provide an improved ignition chamber and valve housing for the motor.

I attain these and other objects and advantages by the mechanism illustrated in the accompanying drawings, in which F ig. 1, is a side elevation of my motor,-

with a fly wheel removed and the crank shaft shown in section;

Fig. 2, is a top plan view of the motor, with parts shown in section;

Fig 3, is an end elevation, with parts shown in section; and

Figs. 4, 5, 6, and 7, are diagrams showing the operation of the cams and valves when both cylinders are working.

Similar numerals refer tosimilar parts throughout the several views.

The cylinders 1 land 2 are arranged in tandem and preferably formed integral with each other and the frame 3, and are provided with the usual water jacket 4. The cylinder 2 is formed by an enlarged continuation of the cylinder 1. The two pistons 5 and 6 are preferably formed in one piece, the piston 5 being extended and enlarged to form the annular piston 6, which in the referred form is of the same a rca as the piston 5, so that the two cylinwrs and pistons have the same cross sec- Iional area. A connecting rod 7 operatively connects the pistons 5 and 6, with the crank shaft 8, which is mounted in the frame 3.

The frame 3 is secured to a base 9 by means of bolts 10. The base 9 is hollow and adapted to receive the gas tank 11. A surge tank or hopper 12, is secured to the cylinders 1 and 2 by means of bolts 13, and opens into the water jacket 4. A pipe 14 connects the hopper 12 with the water jacket 4 at the end of the cylinder 1. The

usual drain 15 is provided for the water jacket. Fly wheels 16 are secured to the crank shaft 8, and pulleys 17 and 18 are mounted on the ends of the shaft. Suitable lubricating devices 19 are provided for those parts which are subject to heavy duty. A priming. cup 20 is provided for the cylinder 1.

A housing 21 is secured to the cylinders by means of screws 22, this housing is provided with an inletchamben 23, and an exhaust chamber 24, between the inlet and exhaust chambers are the ignition chambers 25 and 26, which communicate with the cylinders 1 and 2 by means of ports 27 and 28 respectively. An inlet valve 29 opens from the inlet chamber 23 into the ignition chamber 25, and through the port 27 to the cylinder 1, and an inlet valve 30 opens from the inlet chamber 23 into the ignition chamber '26, and through the port 28 to the cylinder 2. An exhaust valve 31 opens from; the ignition chamber 26 into the exhaust chamber 24, and an exhaustvalve 32 opens from the ignition chamber 25 into the exhaust chamber 24, which opens to the atmosphere in the usual manner, as by an exhaust pipe 75. The ignition chambers 25 and 26 are provided with suitable ignition devices, such as the spark plugs 33, connected with a magneto 34, having the usual lever 35 for changing the spark. A gear 54 on the armature shaft meshes with a gear 52 on the cam shaft 48 to drive magneto.

A gas mixer 36 is connected to the inlet chamber 23 and receives its supply of gas through the perforated pipe or nozzle 37, which is connected with the gas tank 11, by a pipe 38 provided with suitable control valves 3.9 and 40. The mixer has the customary air damper 41, and butter-fly valve 42. A needle valve 43 controls the supply of gas at the nozzle 37 and serves to regulate the mixture.

The exhaust valves 31 and 32 are operated the j by the usual push rods 44 and 45, which are actuated by cams 46 and 47, mounted on shafts 48 and 49, which are geared together so as to revolve in opposite directions at the same speed, by the gears 50 and 51, and are driven by the gear 52 on the shaft 48 meshing with the gear 53 on the crank shaft 8.

Secured to thepush rod 44 is a collar 55, projecting from this collar is a stud or bolt 56. In the path of this stud or bolt a disk 57 having a cam surface 58, and a handle 59, is pivotally mounted, so that on turning the disk by means of the handle 59, the cam surface 58 may be brought against the stud or bolt 56, and the push rod 44 moved and held, so as to open and hold the exhaust valve 31 oil from its seat, thereby opening the cylinder 2 to the atmosphere through the exhaust, and preventing any charge being drawn in, or any compression taklng place in this cylinder.

A rod 60 is pivotally connected to the arm of the butter-fly valve 42, and pivoted at its other end to a. rocker arm 61, the other end of the rocker arm is pivotally connected by means of the link 62, to the sleeve 63, ac-

tuated by the governor 64. A spring connected to the rocker arm 61 and to one end of the speed change lever 66, and kept in tension thereby, tends to prevent the governor 64 from opening, a downward movement of the lever relieves the tension on the spring 65 and allows the governor to open easier, to actuate the rod 60 and close the valve 42, and thereb lower the speed of the motor.

In tlie operation of my motor, in starting it, or when small power is required the handle 59 is turned to force the cam 58 against the bolt 56, and cause the ush rod 44 to hold the exhaust valve 31 o from its seat,

and thus open the cylinder 2 to the atmosphere, and thereby preventin any charge rom being drawn into that cy inder, or any compression taking place therein. The motor now operates as a single cylinder four cycle motor giving one impulse to the crank s aft every tworevolutions, and can be readily started, since the piston is of small area, and the compression easily overcome. The charge is drawn from the gas tank 11, through the pipe 38, mixer 36, inlet chamber 23, valve 29, ignition chamber 25, and port 27, to the cylinder 1, and after the firing stroke exhausted through the port, 27, ignition chamber 25, and through the valve 32 into the exhaust chamber 24 to the atmosphere. By means of the lever 66 and speed controlling mechanism connected therewith, a regulation of the speed of the motor within a range of from three hundred to six hundred revolutions per minute maybe effected, thus providing a considerable change of power. If morepower is required the handle 59 is turned to release the push rod 44 so that it will be acted upon by the cam 46, and the valve 31 permitted to seat itself. The cylinder 2 which is of the same area in cross section as the cylinder 1, will now also be placed in operation, the cylinder 1 serving as a starting motor for the cylinder 2, the charge for this cylinder is drawn in through the mixer 36, chamber 23, valve 30, ignition chamber 26, and port 28, to the cylinder 2, and the exhaust will be through the port 28, ignition chamber 26, valve 31, and exhaust chamber 24 to the atmosphere. The valves are so timed, that with both cylinders in operation there will be one firing stroke for each revolution, and since the charges are burned in different cylinders, and the waste gases removed through different passages, there is little danger of overheating. By placing both cylinders in 0 oration the power is doubled, and'by use 0 the lever 66 the same ranges of speed may be obtained as when using a single cylinder. If less power is required, the cylinder 2 may be cut out of operation at any time by means of the lever 59, and the motor operated as a single cylinder motor. In changing from one to two cylinders or vice versa no regulation of the mixture is re uired, since the only difference will be t at the charges are taken in more or less often, that is once for each revolution when both cylinders are working, and only once for every two revolutions when one cylinder is working.

"While I have shown and described specific structures for accomplishing the desired objects, my invention contemplates broadly the use of means operating in the same manner to produce the results desired, and is to be understood as limited on only by the state of the art.

I claim:

1. In an internal-combustion motor of the four cycle t pe, the combination of, a base member a apted to contain a supply of gas, a frame secured to the base member, cylinders of equal sectional area arranged in tandem on said frame, pistons in said cylinders, a crank shaft, a connecting rod connecting said pistons and crank shaft, a housing secured to said cylinders provided with inlet, exhaust, and a plurality of ignition chambers, valves in said housing openin each ignition chamber to the inlet and ex iaust chambers, each cylinder being provided with a port connecting it with an ignition chamber, a gas mixer connected to the inlet chamber and to the gas supply, means for changing the s d, and means for causing one of the cylinders to idle.

2. In an internal-combustion motor of the ,four cycle type, the combination of, a pair of c hnders of equal cross-sectional area arrange in tandem, a unitary iston member ada ted to reciprocate in said cylinders,

means or converting the reciprocating motion of the piston member into a rotary moprovided with a port communicating with,

an ignition chamber, a push rod for operatmg an exhaust valve, a member projectlng from said rod, a pivoted cam member adapt ed to engage said'projecting member and raise and hold the exhaust valve off from its seat.

3. In an internal-combustion motor of the four cycle type, the combination of a pair of cylinders of equal sectional area arranged in tandem, a unitary piston member adapted to reciprocate in said cylinders, means for converting the reciprocating motion of the piston member into a rotary n10- tion, a housing securedto said cylinders provided with inlet, exhaust, and a plurality of ignition chambers, valves in said housing opening each ignition chamber'tothe inlet and exhaust chambers, each cylinder being provided with a port connecting it with an ignition chamber, a push" rod for operating an exhaust valve, a member projecting from said rod, a pivoted cam member adapted to engage said projecting member and raise and hold the exhaust valve oil from its seat, a butter-fly valve for controlling the supply of mixture to the inlet chamber, governor mechanism for actuating said valve, a spring connected to said mechanism, and a hand lever connected to said spring for increasing or decreasing its tension to retard or ease the operation of the governor.

4. In an internal-combustion motor of the four cycle type having a plurality of cylinders arranged in tandem, means whereby one or more of said cylinders may be operated as desired, a butter-fly valve controlling the supply of mixture, governor mechanism for actuating said valve, a spring connected to said mechanism, and a hand lever connected to said" spring for increasing or decreasing I its tension to retard or case the operation of the governor.

5. In an internal-combustion motor of the four cycle type having a plurality of cylinders arranged in tandem, each provided with an exhaust valve, push rods for operating said valves, a collar securedv to one of said push rods, 'a bolt projecting from said collar, a pivoted cam member adapted to engage said bolt and raise and hold the-valve off from its seat, a butter-fly valve controlling the supply of mixture, governormechanism for actuatin said valve, a spring connected to said mec anism, and a hand lever connected to said spring for increasing or decreasing its tension to retard or ease the operation of the governor.

6. In an internal-combustion motor of the four cycle type, a pair of cylinders of equal area in cross section arranged in tandem, a untiary piston member adapted to reciprocate in said cylinders, means for converting the reciprocating motion of the piston member into a rotary motion, means for causing one of the cylinders to idle, governor means for controlling the supply of mixture, and means for easing and retarding the operation of the governor, and means whereby an impulse may be given to the piston member at eaclrrevolution.

7 In an internal combustion motor of the four cycle type, the combination of a plurality of cylinders, a housing secured to said cylinders provided with inlet, exhaust, and a plurality of ignition chambers, valves in said housing opening each ignition to the inlet and exhaust chambers, ea-ch cylinder being provided with a port communicating with an ignition chamber, a push rod for operating an exhaust valve, a member projecting from said rod, and a pivoted cam member adapted to/engage said pro jecting member and raise and hold the oxhause valve off from its seat.

8. In an internal combustion motor of the four cycle type, the combination of a pair of cylinders, a housing secured to said cylinders, provided with inlet, exhaust, and a plurality of ignition chambers, valves in said housing. opening each ignition chamber to the inlet and exhaust chambers, each cylinder being provided with a port communicating with an ignition chamber, means for operating an exhaust valve, and means adapted to engage said operating means and raise and hold the exhaust valve oil in said housing opening each ignition chann her to the inlet and exhaust chambers, each cylinder being provided with a port communicating with an ignition chamber, a push rod for operating an exhaust valve, a collar secured to said push rod, a bolt projecting from said collar, and a pivoted ram member adapted to engage said bolt and raise and hold the valve off from its seat.

10. In an internal combustion motor of the four cycle type having a plurality of cylinders, a housing adapted to be secured to'the cylinders provided with inlet, exhaust, and a plurality of ignition chambers, valves in said housing opening each ignition chamber to the inlet and exhaust chainbers, means for operating an exhaust valve, and means adapted to engage said operating means and raise and hold the exhaust valve off from its seat.

11. In an internal combustion motor of the four cylcle type having a plurality of cylinders, a housing adapted to be secured to the cylinders and provided with inlet, exhaust, and a plurality of ignition chambers, valves opening each ignition chamber to the inlet and exhaust chambers, a push rod for operating an exhaust valve, a member projecting from said rod, and a pivoted cam member adapted to engage said projecting member and raise and hold the exhaust valve oil from its seat.

' 12. In an internal combustion motor of the four cycle type having a plurality of cylinders, a housing adapted to be secured to the cylinders and provided with inlet, exhaust, and a plurality of ignition chambers. valves in said housing opening each ignition chamber to the inlet and exhaust chambers, a push rod for operating an exhaust valve, a collar secured to said push rod, a bolt projecting, from said collar, and a pivoted cam member adapted to engage said bolt and raise and hold the valve off from its seat.

13. In an internal combustion motor of the four cycle type, a pair of cylinders of equal cross-sectional area arranged in tandem, a unitary piston member adapted to reciprocate in said cylinders, means for converting the rcciprmvating motion of the piston member into a rotary motion, separate inlet and exhaust valves for each cylinder, and means for holding the exhaust valve of one cylinder open causing the cylinder to idle.

FRANK A. BENTZLIN. 

